Equivalent & Substitute Parts for Coto Technology 9081-24-00

Part Overview

The Coto Technology 9081-24-00 is a reed relay with SPST-NO contact configuration rated for 500 mA at 24 VDC coil voltage. This component belongs to the 9000 Spartan series and features through-hole PC pin termination suitable for printed circuit board assembly. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value
Coil Voltage	24 VDC
Contact Form	SPST-NO (1 Form A)
Contact Rating (Current)	500 mA
Switching Voltage (Max)	200 VAC / 200 VDC
Coil Current	12 mA
Coil Resistance	2 kOhms
Mounting Type	Through Hole
Termination Style	PC Pin
Must Operate Voltage	18 VDC
Must Release Voltage	2 VDC
Coil Type	Non Latching

Substitute Part Grouping Explanation

Substitution of the Coto Technology 9081-24-00 is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

Coil voltage: 24 VDC
Contact form: SPST-NO (1 Form A)
Contact current rating: 500 mA minimum
Coil current: 12 mA
Coil resistance: 2 kOhms
Must operate voltage: 18 VDC minimum
Must release voltage: 2 VDC maximum

Mechanical Compatibility Requirements:

Mounting type: Through Hole
Termination style: PC Pin

Functional Requirements:

Coil type: Non Latching
Switching voltage capability: 200 VDC minimum

The Littelfuse HE3321A2400 satisfies all mandatory electrical and mechanical parameters, enabling direct substitution in applications requiring the 9081-24-00 specification.

Parameter Comparison

Parameter	Coto 9081-24-00	Littelfuse HE3321A2400	Match Status
Coil Voltage	24 VDC	24 VDC	Equivalent
Contact Form	SPST-NO (1 Form A)	SPST-NO (1 Form A)	Equivalent
Contact Rating (Current)	500 mA	500 mA	Equivalent
Switching Voltage (Max)	200 VAC / 200 VDC	200 VDC	Compatible
Coil Current	12 mA	12 mA	Equivalent
Coil Resistance	2 kOhms	2 kOhms	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Termination Style	PC Pin	PC Pin	Equivalent
Must Operate Voltage	18 VDC	18 VDC	Equivalent
Must Release Voltage	2 VDC	2 VDC	Equivalent
Coil Type	Non Latching	Non Latching	Equivalent
Operating Temperature Range	-20°C ~ 85°C	-40°C ~ 85°C	Littelfuse exceeds specification
Product Status	Obsolete	Active	Substitute is current production
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both compliant

Engineering Selection Recommendations

The Littelfuse HE3321A2400 is the direct functional equivalent for the obsolete Coto Technology 9081-24-00. Selection of this substitute is supported by the following factors:

Product Status: The Littelfuse HE3321A2400 is classified as active production, ensuring long-term availability and supply chain continuity compared to the obsolete Coto part.

Electrical Equivalence: All critical electrical parameters match exactly, including coil voltage, contact rating, coil current, and coil resistance. Switching voltage capability is equivalent at 200 VDC.

Mechanical Compatibility: Both components feature identical through-hole mounting and PC pin termination, enabling direct board-level substitution without layout modifications.

Compliance Certifications: Both parts maintain RoHS compliance (Coto RoHS Compliant; Littelfuse ROHS3 Compliant) and REACH unaffected status, satisfying regulatory requirements for equivalent applications.

Operating Temperature: The Littelfuse substitute provides an extended operating temperature range (-40°C to 85°C) compared to the original part (-20°C to 85°C), offering enhanced performance margin in low-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse HE3321A2400 be used as a direct replacement for the Coto 9081-24-00 without circuit modifications?

A: Yes. The HE3321A2400 matches all critical electrical parameters (24 VDC coil voltage, 500 mA contact rating, 12 mA coil current, 2 kOhms coil resistance) and mechanical specifications (through-hole, PC pin termination). No circuit design changes are required.

Q: What are the key differences between these two relays?

A: The primary differences are product status and operating temperature range. The Littelfuse part is active production (versus obsolete for Coto) and operates from -40°C to 85°C (versus -20°C to 85°C for Coto). The Littelfuse part also specifies 200 VDC switching voltage, while the Coto part specifies 200 VAC and 200 VDC.

Q: Are the operate and release times identical between these parts?

A: No. The Coto 9081-24-00 specifies 0.5 ms operate time and 0.2 ms release time. The Littelfuse HE3321A2400 specifies 1 ms operate time and 1 ms release time. Applications with strict timing requirements must evaluate this difference.

Q: What packaging options are available for the substitute part?

A: The Littelfuse HE3321A2400 is supplied in bulk packaging. The original Coto part packaging specification was not provided in the available data.

Q: Are both parts RoHS compliant?

A: Yes. The Coto 9081-24-00 is RoHS Compliant, and the Littelfuse HE3321A2400 is ROHS3 Compliant. Both satisfy RoHS requirements for equivalent applications.

Q: Which part should be selected for new designs?

A: The Littelfuse HE3321A2400 should be selected for new designs. It is active production, ensuring availability and support throughout the product lifecycle. The Coto part is obsolete and not recommended for new applications.

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